Question

A 4.7 cm × 3.9 cm razorblade is placed on the surface of
abeaker of water. Though the density of the razorblade is
greaterthan the density of the water, the razorblade floats because
it hasnot exceeded the surface tension of the water. Thus, no part
of therazorblade is submerged. When 47staples are placed onto the
razorblade, it sinks. Given that themass of the razorblade is 0.55
g andthe mass of a staple is 0.02 g, answerthe following
questions.

a.) At the moment the razorblade sunk, what wasthe
total mass in kg? Include both the razorblade and the stapleson
it.
1
kg

b.) At the moment the razorblade sunk, what wasthe
total weight in N? Include both the razorblade and the stapleson
it.
2 N

c.) Determine the area of the razorblade
inm2.
3
m2

d.) The surface tension is the maximum pressurethe
water surface can withstand without allowing any part of theobject
to be submerged. By calculating the pressure that was beingexerted
on the water surface at the moment the razorblade sunk, youcan get
a good approximation for the surface tension of water.Perform this
calculation.
4

Because Archimedes' Principle
onlyapplies to fluids and water isn't a fluid.Because no
partof the razorblade is
submerged.Because the
razorblade is not afluid.Because
Archimedes' Principle onlyapplies to objects that are
sinking.Because there isno buoyant force on the
razorblade.